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采用聚苯胺(PANI)为改性剂对Mm0.78Mg0.22Ni2.48Mn0.09Al0.23Co0.47(Mm由82.3%La和17.7%Nd组成)(AB3)储氢合金进行表面改性,以提高其电化学和动力学性能。运用X射线衍射(XRD)技术分析了合金相结构,结果表明:添加PAN2后合金电极的相结构并没有发生改变。电化学测试结果表明:添加PAN2后AB3合金电极的放电容量有所降低,但循环稳定性得到很大的提高,50个充放电循环后电极的容量保持率由原来的83.3%增加到93.3%(AB3/2wt%PANI);合金电极的动力学性能也得到了改善。
Surface modification of Mm0.78Mg0.22Ni2.48Mn0.09Al0.23Co0.47 (Mm composed of 82.3% La and 17.7% Nd) (AB3) hydrogen storage alloy with polyaniline (PANI) as modifier to improve its Electrochemical and kinetic properties. The phase structure of the alloy was analyzed by X-ray diffraction (XRD). The results showed that the phase structure of the alloy electrode did not change after adding PAN2. The results of electrochemical tests showed that the discharge capacity of AB3 alloy electrode decreased with the addition of PAN2, but the cycling stability was greatly improved. The capacity retention rate of the electrode increased from 83.3% to 93.3% after 50 charge-discharge cycles AB3 / 2wt% PANI); the kinetic properties of the alloy electrode have also been improved.